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Book Chapter

CHAPTER 6: TIME DOMAIN ELECTROMAGNETIC PROSPECTING METHODS

By
Misac N. Nabighian
Misac N. Nabighian
Newmont Exploration Ltd., 1700 Lincoln Street, 26th Floor, Denver, CO 80203.
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James C. Macnae
James C. Macnae
Lamontagne Geophysics, Ltd., 4A Whiting Street, Artarmon, NSW 2068, Australia.
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Published:
January 01, 1991

INTRODUCTION

In the traditional frequency-domain electromagnetic (FEM) methods of exploration the ground is energized by passing an alternating current (ac) through an ungrounded loop situated usually on or above the surface of the earth. The primary field of the loop will induce eddy currents in all conductors present in the earth. The secondary electromagnetic (EM) fields due to these induced currents, together with the primary EM field, are recorded with a suitable receiver at various points in space. In general, the secondary EM field at the receiver, which contains all the information regarding the underground conductors, may be several orders of magnitude smaller than the primary field. Under these conditions the separation of the measured total EM field into its primary and secondary parts is difficult.

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Contents

Investigations in Geophysics

Electromagnetic Methods in Applied Geophysics: Volume 2, Application, Parts A and B

Society of Exploration Geophysicists
Volume
3
ISBN electronic:
9781560802686
Publication date:
January 01, 1991

GeoRef

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